Rotary pump



May 13, 1930. .1.3. TEESDALE ROTARY PUMP v v INVENTOR v B' TQQSCZCJQ,

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ror cap 3, these parts being securely joined by Patented May 13, 1930 ENT OFFICE JOHN IB. TEESDALE, OF GRAND RAPIDS, MICHIGAN ROTARY PUMP application meapnay e, 192s. serial Neissa-8e4.

The present invention relates to pumps; and its object is, generally, to provide a rotary pump improved in respects heremafter appearing; and more particularly, to prov1de such a pump having a gate member movable into and out of fitting contact with the pumps rotor piston, and inlet and outlet ports so arranged relatively to the gate member that the same may be moved out of such Contact by a certain degree of pressure thereon exerted by o the pumped fluid; and further, to provide body of this speciiication means for adjusting -the degree of such required pressure; and further, to provide insuch a pump, a gate member properly balanced between fluid pressures on its opposite sides; and further, to provide in such a pump improved and eiectively positioned ports; and further to provide in such a pump improved means for returning to the' pump fluid leaking therefrom into its bearings.

These and any other objects hereinafter appearing are attained by, and the invention finds preferable embodiment in, the pump hereinafter. particularly described in the and illustrated by the accompanying drawings, in which:

Figure 1 is a side view of a rotary pump, certain parts being shown in axial section taken on line 1-1 of Figure 2;

Figure 2 is a transaxial sectional view thereof taken on line 2 2 of Figure 1;

Figure 3 isa side view of the same viewed at right angles to the direction in which Figure 1 is viewed, certain parts being shown in axial section;

Figure 4 is a front Yview of the same;

Figure 5 is a view of a rear cap, the rotor pistons shaft being shown in transverse section; and

Figure 6 is a transaxial sectional view of a rotary pump showing a modified construction of certain parts.

The rotary pump illustrated by these draw ings has a body comprising a rear portion 1, an intermediate portion 2 and a front portion screws 4 passing through portions 2 and 3 Yand threaded in portion 1. This body thus formed has a cross-sectionally round chamber 5 and a fluid passage 6 communicating there-v ber 5 ttingly contacts `with and having an inlet port7 .for the -uid 8 through which the fluid is discharged from the pump. v

A rotor piston 9 in the chamber 5 is driven by suitable power. applied 4to its shaft 10 turning in a rotary bearing 12 in the sleeve 11 held in the bore 13 of portion 1 of the body. This piston is cross-sectionally round, is of less diameter than the chamber and its axis of rotation (the axis of its -shaft 10) is offset from the axis of the chamber as shown.

A gate 14 is swingably movable in said passage, one end ofthe portion l5 turning 'in the rotary bearing 16 formed in the body portion 2 adjacent `the passage 1. Thus mounted and swingable, the gates free end 17 extending into the chamthe side of the rotor piston and separates the passage 6 into a part 18 into which the fluid enters through the inlet port 7 and a part 19 through which theA pumped Huid passes from the chamber 5 and into the outlet or discharge port 8. This gate is pressed into fitting contact with the rotor piston by asuitable spring 2O in an opening 21 through the body portion 2 and pressing between the slidable head 22 (contacting the gate) and the screw plug 23 which may be.

turned to regulate the tension of said spring.`

It will be seen that when the piston is rogate havinga journal pump through the outlet port 8.@ Furtherjy more: It will also be-seen that when the piston is being rotated fa-sterthan a predeterf' mined speed and more fluid is' thus being pumped-than the predetermined amount, the pressure of the `fluid issuing'from chamber 5 into part 19 lof passage 6 presses" upon that side 25` of the gate which formsthe wall ,of said part 19 with such force as to swing the gate and move its free end 17 .out of contact.. with the piston, such'swingfing movement of the gate compressing the spring 20' further than the degree to'which the turnedposition of the screw plug 23 has tensioned it, such turned position of the plug measuring the amount of fluid desired to be pumped from the source of supply during a certain time; and it will be seen that, when the pre-adj usted tension of the spring is thus increased by the increased pressure of fluidhbeing pumped at the time, and the free end 17 of the gate having-been thus moved out of contact with the piston, a portion only of the fluid in part 19 of the passage 6 is discharged through the outlet port 8, the rest of the Huid being moved past the end 17 of the gate and driven round and round in the chamber 5 by the pistons rotation; and also, when the outlet 8 or the pipe leading therefrom is closed by a vvalve or otherwise, all the fluid entering the pump is thus driven round and round in the chamber. It will be thus understood that when the tension of spring 20 is adjusted as desired, the amount ofA fluid delivered from the pump may be governed correspondingly; and that, if the delivery from the pump be entirely shut off, no harm will result from the continued rotation of the piston.

In the modified construction shown in Figure 6, the middle portion 21 of the body of thel pump contains operating parts similar to those seen in the other views; but in Figure 6, the gate 141 is shorter and the parts 181 and 191 of the passage 61 are so positioned andrelated to the gate 141 that the gate is fairly evenly balanced between fluid pressures on its opposite sides, and therefore the spring 20 is under only slight tension during the normal pumping operation. In this view, the outlet port 81 from part 191 of passage 61 extends at 26 through the side of the gate and then at .27 in the axial direction of the gates swinging movement to a vent to the outside of the pumps body.

In Figures 2 and indicated extending from an annular groove 29 in the inner surface of sleeve 11 to part 18 of passage 6 adjacent the inlet port 7.

Fluid leaking from the chamber 5 along the pistons shaft 10 is thus drawn by the pumpingr operation again into this passage 6 and into chamber 5.

The present invention involves a pump structure resembling that shown in my pending application Serial No. 304,5924 filed September 7 1928, but is an improvement as above indicated thereover.

The invention being intended to be pointed out in the claims, is not to be limited to or by details of construction of any particularembodiment thereof illustrated by the drawings or hereinbefore described.

I claim:

1. In a pump of the character described: a

body having a cross-sectionally round chamber and a passage communicating therewith; a rotor piston in the chamber; a ate in the passage movable into and out of tting con- 3 a small passage 28 isA tact with the piston; an inlet port to the passage at one side of the gate; an outlet port from the passage at the opposite side of the gate admitting pumped fluid into the passage and pressing directly on the gatein the direction tending to move the same out of its said contact with the piston; means for normally holding the gate in Contact `with the piston.

2. In a pump of the character described:

a body having a cross-seotionally round chamber and a passage communicating therewith; a rotor piston in the chamber; a gate in the passage movable into and out of itting contact with the iston; an inlet port to the passage at one si e of the gate; an outlet port from the passage at the opposite side of the gate admitting pumped iuid into the passage and pressing directly on the gate in the direction tending to move the same out of its said contact with the piston; a spring urging the gate intoV its said contact with the piston.

3. In a pump of the character described: a body having a cross-sectionally round chamber and a passage communicating therewith; a rotor piston in the chamber; a gate in the passage movable into and out of litting Contact with the piston; an inlet port to the passage at one side of the gate; an outlet port from thepassage at the opposite side of the gate admitting pumped fluid into the paschamber and a passage communicating therewith; a rotor piston in the chamber; a pivotally mounted gate in the passage swingable into and out of fitting contact with the piston; an inlet port to the passage at one side of the gate; an outlet port fromthe passage at the opposite side of the gate admitting pumped fluid into the passage and pressing directly on the gate. in the direction tending to swing the same out of its said contact with the piston; means for normally holding the gate in contact with the piston. v

5. In a pump of the character described: a body having a cross-sectionally round chamber and a passage communicating therewith; a rotor piston in the chamber; a pivotally mounted gate in the passage swingable into and out of fitting contact'with the pistori; an inlet port to the passage at one side of the gate; an outlet port from the passage at the opposite side of the gate admitting pumped iiuid into the passage and pressing directly on the gate in the direction tending to swing the same out of its said contact with the piston; a sprinlurging thevgate into its said contact wlth e piston.

6.- In a pump of the character described: a body having a cross-sectionall round chamber and a passage communicating therewith; a rotor piston 1n the chamber; a pivotally mounted gate in the passage swingable into and out o tting contact with the piston; an inlet port to the passage at one side of the gate; an outlet port from the passage at the opposite side of the gate admltting pumped iuid into the passage and `pressing directly on the gate in the direction tending to swing the same out of its said contact with the piston; a spring urging the gate into its said Contact with the piston; means for regulatin the tension of the spring.

g. In a pump of the character described: a body having a cross-sectionally round chamber and a passage communicating therewith, and having also a rotary bearing; a rotor piston in the chamber; a gate in the passage having a journal portion turnable in said bearing, the gate being swingable into and out of fitting contact with the piston; inlet and outlet orts to and from the passage at opposite si es respectively of the gate, one of said ports extending throu h the gate.

In testimon whereof I Iiave hereunto set my hand at (grand Rapids, Michigan, this 1st day of May, 1929.

, B. TEESDALE. 

